US Representative Michael E. Capuano, whose Congressional district includes a wide swath of Boston, is set to endorse mayoral candidate Martin J. Walsh on Monday, according to advisers to Capuano and Walsh.

The nod from Capuano, a former Somerville mayor and one of the most liberal Democratic members of Congress, could be a boon to Walsh’s progressive bona fides and will boost his already hefty roster of endorsements from other elected officials.

“Congressman Capuano believes that Marty’s life history and his career, filled with helping those in need, uniquely positions Marty Walsh as mayor to be a powerful progressive voice for Boston,” said the Capuano adviser, Paul Trane.

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Michael Goldman, a senior adviser to Walsh, confirmed the endorsement and said it was set to be announced at 10 a.m. event in Hyde Park.

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